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Module Example1.
CoInductive wrap : Type :=
| item : unit -> wrap.
Definition extract (t : wrap) : unit :=
match t with
| item x => x
end.
CoFixpoint close u : unit -> wrap :=
match u with
| tt => item
end.
Definition table : wrap := close tt tt.
Eval vm_compute in (extract table).
Eval vm_compute in (extract table).
End Example1.
Module Example2.
Set Primitive Projections.
CoInductive wrap : Type :=
item { extract : unit }.
CoFixpoint close u : unit -> wrap :=
match u with
| tt => item
end.
Definition table : wrap := close tt tt.
Eval vm_compute in (extract table).
Eval vm_compute in (extract table).
End Example2.
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